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Toshiba monitor on-off

I have a Toshiba flat-screen monitor form my home computer. (I'm at work now, so I don't have the model # handy.) A few nights ago, I turned the monitor off to save energy. When I turn it back on, the on-off switch flashes blue about every other second, but the monitor does not light up. I tried jiggling the mouse, hitting keys of the keyboard, and -- ultimately -- turning off and restarting the computer. No luck. Any ideas?

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